Texas Comptroller of Public Accounts

Texas Comptroller of Public Accounts, Glenn Hegar

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Texas Specification No. 055-20-02
Effective Date:May 29, 1992
Reformatted Date:

1.SCOPE:This specification establishes requirements for the
purchase and after-market installation of fuel conversion
systems to convert vehicular gasoline engines to operate on
liquefied petroleum gas (LPG).(See Texas Specification No.
055-20-01 for the conversion of vehicular gasoline engines to
compressed natural gas (CNG).

specifications, standards, test methods, and other documents
shall be to the issues in effect on the date of the Invitation
for Bids.Copies of the referenced documents may be obtained
from the issuing organizations at the addresses shown.In the
event requirements in this specification are in conflict with
rules and/or regulations of the Federal government, the rules
and/or regulations of the Texas Air Control Board, or the
Railroad Commission of Texas, shall take precedence in that
order.The following publications form a part of this
specification to the extent specified herein:

El Monte, CA91731-2900:

2.1.1. Approved LPG and CNG Conversion Systems, February 6,
1992,(or current edition).

2.2.GAS PROCESSORS ASSOCIATION (GPA), 6526 East 60th Street,
Tulsa, OK 74145:

2.2.1.GPA Publication No. 2140-75 -- GPA Liquefied Petroleum
Gas Specifications and Test Methods.

Austin, TX78773-0001: Rules, Chapter 23 -- Vehicle Inspection.

2.3.2.Texas Procurement and Support Services (TPASS), P. O. Box 13186,
Austin, TX 78711: Cost Effectiveness of Alternative Fuels Using Life
Cycle Cost Benefit Analysis, 3rd. Printing, December 1, 1992. Specification No. 070-AT-XX --Specification
for Automobiles and Trucks (current edition). Specification No. 070-SB-XX -- Specification for
School Buses (current edition).

2.3.3.RAILROAD COMMISSION OF TEXAS (RCC), 1701 North Congress Avenue,
Austin, TX78711: for Liquefied Petroleum Gas. 2.3.4.TEXAS AIR CONTROL BOARD (TACB), 12124 Park 35 Circle,
Austin, TX78753: of Air Pollution from Motor Vehicles,
Regulation IV., Revised, August 30, 1991.

Motor Vehicles, P. O. Box 2293, Austin, TX78768: Motor Vehicle Code, V.T.C.S. Art. 4413(36).

2.4.FEDERAL DOCUMENTS:Superintendent of Documents,
U.S.Goverment Printing Office, Washington, DC 20402:

2.4.1.Code of Federal Regulations -- CFR, Title 40, Part 85:
Control of Air Pollution from New Motor Vehicles and New Motor
Vehicle Engines, Environmental Protection Agency (EPA).
3.CLASSIFICATION:Gasoline-to-liquefied petroleum gas
conversion systems shall be classified by original equipment
manufacturer and engine size as follows (in cubic inch
displacement unless followed by an "L" suffix indicating
displacement in liters):(Ordering entity must specify whether
the engine is carbureted or electronic fuel injected):

3.1.Chevrolet/GMC: 3.1.1. 97-I4

3.1.2. 133-I4

3.1.3. 151-I4

3.1.4. 191-V6

3.1.5. 262-V6

3.1.6. 305-V8

3.1.7. 307-V8

3.1.8. 350-V8

3.1.9. 366-V8

3.1.12.Other 4-cylinder

3.1.13.Other 6-cylinder

3.1.14.Other 8-cylinder

3.2.Chrysler: 3.2.1. 135-I4

3.2.2. 146-I4

3.2.3. 153-I4

3.2.4. 181-V6

3.2.5. 201-V6

3.2.6. 203-V6

3.2.7. 205-V6

3.2.8. 239-V6

3.2.9. 242-I6

3.2.12.Other 4-cylinder

3.2.13.Other 6-cylinder

3.2.14.Other 8-cylinder

3.3.Ford: 3.3.1. 1.9L-I4

3.3.2. 2.3L-I4

3.3.3. 3.0L-V6

3.3.4. 3.8L-V6

3.3.5. 4.0L-V6

3.3.6. 4.6L-V8
3.3.7. 4.9L-I6

3.3.8. 5.0L-V8

3.3.9. 5.8L-V8

3.3.12.Other 4-cylinder

3.3.13.Other 6-cylinder

3.3.14.Other 8-cylinder


3.4.1. Manufacturer -- Engine Sizes

4.DEFINITIONS:Terminology used in this specification is
intended to be generic in nature and consistent with meanings
that have been defined through general use and/or accepted trade
practices.Where variant meanings may exist, the applicable
interpretation shall be determined by the Texas Procurement and Support Services (TPASS).

4.1.Alternative Fuels:Fuels used to propel vehicular engines
including natural gas, electricity, liquefied petroleum gas,
methanol and others as defined by the Texas Air Control Board.

4.2.ASME:American Society of Mechanical Engineers.

4.3.Bi-Fueled Engine:an engine capable of operating either on
a conventional fuel or an alternative fuel, but not

4.4.CARB:California Air Resources Board.

4.5.CNG:Compressed Natural Gas.

4.6.Commission:Texas Procurement and Support Services (TPASS).

4.7.Conversion Facility:The firm performing the conversion of
an engine to operate on an alternative fuel.

4.8.Dedicated Fueled Engine:An engine, originally designed to
operate on a conventional fuel, which has been converted to use
an alternative fuel only; or an engine designed to operate on an
a single fuel only.

4.9.DOT:United States Department of Transportation.

4.10.Dual-Fueled Engine:An engine capable of simultaneous
operation on a mixture of a conventional fuel and an alternative
fuel.(See Fumigated Engine.)

4.11.Equivalent Gallon:The amount of natural gas at standard
conditions containing the same energy content (114,000 BTUs) as
one gallon of unleaded gasoline (approximately 114 cubic feet).

4.12.Fuel Conversion System:A device or series of components
that, when properly installed and adjusted, will permit an
engine, originally designed to operate on a conventional fuel,
to operate on natural gas, liquefied petroleum gas, or other
alternative fuel, or a mixture of diesel fuel and either CNG,
LPG, or other alternative fuel.

4.13.Fumigated Engine:A diesel engine capable of operation on
a mixture of diesel and either natural gas or liquefied
petroleum gas.

4.14.TPASS:Texas Procurement and Support Services.

4.15.LCCBA:Life Cycle Cost Benefit Analysis.

4.16.LNG:Liquefied Natural Gas.

4.17.LPG:Liquefied Petroleum Gas, is any material that is
composed predominantly of any of the following hydrocarbons or
mixtures of hydrocarbons:propane, propylene, normal butane,
isobutane, and butylenes.

4.18.Methanol:A non-petroleum, clear liquid fuel, made
primarily from either natural gas, renewable agricultural waste,
organic garbage, wood or coal.

4.19.Natural Gas:A gaseous fuel consisting principally of

4.20.OEM:Original Equipment Manufacturer.

4.21.Pipeline Quality Natural Gas:Natural gas conforming to
the specifications as defined in NFPA 52.

4.22.Propane:The three-carbon hydrocarbon, C3H8.

4.23.Standard Conditions:A standard pressure and temperature
at which compressed natural gas is measured which is a pressure
of 14.7 pounds per square inch (psi) and a temperature of 70°F.

4.24.Vendor:The business entity having a contract with the
user to provide and/or install fuel conversion systems or to
provide services for the conversion of engines to alternative
fuels.The vendor may or may not be the conversion facility.

4.25.VIN:Vehicle Identification Number.

5.REQUIREMENTS:Products furnished under this specification
shall meet or exceed the following requirements:

5.1.General Requirements: 5.1.1. All conversion systems and accessories shall be new,
unused, and currently a standard product of an established
manufacturer except for such deviations as may be required by
this specification.These conversion systems shall not be a
rebuilt, repaired, reconditioned, display model, prototype, or a
used model.

5.1.2. The conversion system shall be the latest model in
current production and shall have been tested by a reputable
federal test procedure laboratory.Specific design
configurations and test results for any acceptable conversion
system must be approved by the CARB After-market Parts Section,
by any other state air quality regulatory authority, sanctioned
by the EPA (for systems applicable to low altitudes), or
recognized, in writing, by the EPA as satisfying applicable
anti-tampering policies included in Memorandum 1A (1974).
Conversion systems and/or components not certified by one of the
above means will not be considered.All conversion systems must
be maintained in their approved configuration without
substitution or modifications.Any system bid must demonstrate
compliance with one of the three procedures listed in the second
sentence of this paragraph.The burden of proof for system
compliance shall rest with the bidder.

5.1.3. All applicable components of the fuel conversion systems
shall meet or exceed applicable rules of the Railroad Commission
of Texas in effect on the date of the Invitation for Bids.In
addition, all dealers and/or vendors, as required, must be
licensed according to the rules of the Railroad Commission of
Texas and the Texas Department of Transportation, Division of
Motor Vehicles.

5.1.4. The conversion system shall be designed to operate on
liquefied petroleum gas which has approximately 2,500 BTUs per
cubic foot.

5.1.5. Details not specified herein shall be in accordance with
standard commercial practices for products of this type.

5.1.6. The alternative fuel system fuel tank (s) shall be filled
to capacity upon delivery to the ordering agency.

5.1.7. Safety plaques or decals shall be furnished and shall be
affixed at any hazardous area.The plaques or decals shall
include necessary warnings and precautions.Permanent plaques
are preferred to decals.

5.2.Design Requirements:Each conversion system furnished to
this specification shall include, but not be limited to the
following.All other parts or components which are required or
normally included to provide a complete, working fuel conversion
system, shall be furnished.

5.2.1.Fuel Tank (s):Fuel tank (s) shall be manufactured to
ASME standards and shall have separate shut-off/relief valves.
They shall be installed in such a manner to allow for easy
viewing of serial numbers, where accessible.Exterior surfaces
shall be corrosion resistant or shall be treated to resist
corrosion (primed and painted, etc.).Each container shall be
fitted with an approved automatic means to prevent filling in
excess of the maximum permitted filling volume. vehicular fuel tank (s) shall be steel. fuel tanks shall be provided in sufficient
numbers and sizes (capacities) to provide a range (in miles) as
specified in the Invitation for Bids.The range shall be
determined by operation of 100% LPG, not conventional fuels.
The fuel range shall be calculated by multiplying the EPA city
fuel economy rating less 20% of the water capacity of the usable
fuel tank capacity.

NOTE: LPG motor fuel containers on passenger-carrying vehicles
shall not exceed 200 gallon aggregate water capacity.School
buses shall not exceed 115 gallon aggregate water capacity.No
more than two (2) containers shall be mounted on a vehicle.
Fuel containers on school buses shall have a minimum design
working pressure of 312 psig.

5.2.2.Fuel Filter and Vacuum Fuel Lock:A fuel filter and
vacuum fuel lock (or similar device) shall be provided, as
required, to prevent the flow of fuel to the engine when the
engine is not in operation but the ignition key is on.The
device shall be UL listed and shall be either vacuum operated or
operated electrically.

5.2.3.Converter (Regulator/Vaporizer):The pressure regulator
shall be adjusted, adjustable, and tested by the factory.The
regulator shall be water-heated, properly valved, as required
and shall be capable of accepting pressures up to the working
pressure of the vehicle's fuel container (s) and shall deliver
LPG at a pressure acceptable for the mixing devices.The
regulator shall be furnished with brass or Fiberglas-impregnated
nylon fittings.

If the system furnished is of the closed-loop variety, the
regulator shall be capable of being operated satisfactorily in
any position.These regulators shall be designed for each
specific engine so that stoichiometric power settings can be

5.2.4.Carburetor/Gas-Air Mixer:The existing OEM carburetor or
injection system may be used or a LPG carburetor may be
furnished.However, the fuel conversion system shall be tested
and approved by the CARB and listed on their Approved CNG and
LPG Conversion Systems (or possess a CARB Executive Order) prior
to the bid opening date, or otherwise approved and/or recognized
by the EPA (See Paragraph 5.1.2.).The gas/air mixer shall be
specifically designed for efficient mixing of LPG and air at the
correct flow rate for the engine in which it is installed.

5.2.5.Electronic Fuel Management System:If an OEM gasoline
closed-loop feed-back system is employed, a control system which
utilizes state-of-the-art electronic technology to adjust
air/fuel ratio for optimum stoichiometric performance is
required (See Paragraph 5.2.3.).

5.2.6.Control Panel:An electrical fuel selection switch shall
be provided on the instrument panel or in a location convenient
to the vehicle operator.This switch shall allow the operator
to select gasoline operation of LPG operation and shall be so
marked.The operator shall not have to operate any other
controls in switching from one fuel to the other, unless
required by the conversion system manufacturer.

5.2.7.Fittings and Plumbing Materials:LPG fuel lines and/or
fittings shallbe approved by the Railroad Commission of Texas.
Fitting shall be SAE/NPT pipe fittings.Fuel lines shall be
secured to the body or frame in a manner to avoid pinching or
chafing and shall have fastenings (supports) at not more than
two (2) foot intervals.Fuel lines shall be protected by being
placed between the frame rails, if at all possible; otherwise,
these lines shall be placed no closer than eight inches (8")
from any exhaust component and shielded from damage due to
rocks, debris, etc. from the road.The LPG fuel line shall not
be placed adjacent to an exhaust system component without being
shielded.No plumbing or fitting material shall be placed in
the interior passenger compartment of a school bus.If this is
not possible, the ordering agency shall be advised and shall
provide written acceptance of the location.All fuel system
valves and plumbing located in the cargo area shall be protected
with shields.

5.2.8.Refueling Receptacle:The vehicle refueling receptacle
shall be the industry standard one-and-three-fourth inch
(1-3/4") ACME threaded coupling.The vehicle refueling fill
valve shall be installed in one of the following locations on
the vehicle unless otherwise specified in the Invitation for
Bids, and approved by the Railroad Commission of Texas.The
receptacle shall be protected with a dust cap, permanently
attached to the vehicle by means of a metal chain or cable.An
eight inch (8") by fourteen inch (14") minimum size plumbing
chamber door shall be proved in the street side wall of school
buses to allow easy access for filling or securing the service
valve in the even of an emergency.The plumbing service door
shall be hinged and latched, but not locked. filler location, where applicable.(The
gasoline filler shall remain operable.) valve, on fuel container, in accordance with
Railroad Commission of Texas standards. fill valve box.

5.2.9.Manual Shut-off Valve:A manual shut-off valve to
isolate the fuel cylinder (s) from the rest of the LPG system
shall be as required by the Railroad Commission of Texas.

5.2.10. Fuel Gauge:The OEM analogue fuel gauge shall be
utilized to provide accurate available fuel readings for both
gasoline and LPG selectively with the fuel in use.If the
instrumentation is digital, a separate fuel gauge for LPG shall
be furnished and mounted so that it can be easily observed by
the seated driver.

5.3.Installation and Operation:The installation of the LPG
fuel system and the operation of the vehicle after conversion
shall be in accordance with the following:

5.3.1.Installation:The installed conversion system shall
present a neat, well-finished appearance and shall be free of
all imperfections and/or defects which might affect appearance,
normal life, or serviceability.The systems shall be installed
so as not to interfere with normal maintenance tasks such as
tune ups, checking of fluid levels, etc.The installed
conversion system shall not restrict or prevent normal tune up
activities, such as replacement of spark plugs, distributor caps
and rotors, or drive belts nor render inoperative the functions
of the air filter air connection, or any component of the
emission control system of the vehicle unless approved under EPA
guidelines.Fuel tanks mounted in the interior exposed cargo
area of passenger vehicles shall be boxed and covered in
upholstery that color coordinates with the vehicle interior.
All electrical wiring shall be insulated and enclosed in a
fibrous loom, plastic loom, or flexible conduit for protection
from external damage and short circuits.Wiring shall be
securely fastened at sufficient intervals to prevent sagging and
insure clearance of mechanical parts.Routing of the wiring
through the subframe, body, etc., shall be in such a manner so
as not to interfere with the normal operation and use or present
a safety hazard.A sealed splice-free modular wiring harness is
acceptable.Rubber grommets shall be used wherever wires or
harness pass through metal.Workmanship shall be comparable to
that of the OEM.The systems shall be installed in conformance
with the system manufacturer's instructions and recommendations.

5.3.2.Conversion Site:Unless otherwise specified in the
Invitation for Bids, it shall be the responsibility of the
vendor to arrange for pick up and delivery of the vehicle (s)
which are to be converted, at no expense to the ordering state
agency or school district.

5.3.3.Connections:All hose connectors and fittings shall be
compatible.All electrical connections to the vehicle OEM
wiring shall be accomplished with stainless steel, brass or
copper connectors.Aluminum connectors are not acceptable.

5.3.4.Engine Tune-up:Each conversion system installation
shall be made only after the engine has been tuned to the OEM's
specifications by the vendor.

5.3.5.Pre-conversion Dynamometer Test:When so specified in
the Invitation for Bids (See Paragraph 5.7.6.), the conversion
system installation shall be made only after the vehicle has
been operated on gasoline using a dynamometer to measure the
brake horsepower output at the rear or driving wheels and the
pollution levels checked and recorded.

5.3.6.Post-conversion Dynamometer Test:When so specified in
the Invitation for Bids (See Paragraph 5.7.6.), the conversion
system shall be checked on a dynamometer.The engine, when
operating on LPG, shall be adjusted to provide at least 85% of
the power measured in all speed ranges as specified in Paragraph
5.3.5.The engine shall not lose any power when operated on
gasoline.The installing conversion facility will adjust the
engine for maximum performance on both gasoline and LPG.

5.3.7.Dynamometer Test Reports:Copies of all dynamometer test
shall be provided to the owner.This test report shall identify
the vehicle (s) by VIN number.If dynamometer testing is
specified in the Invitation for Bids, payment will not be made
until dynamometer testing documentation is provided.

5.3.8.Engine Operating Characteristics:The engine, after
conversion, shall operate on LPG without hesitation, stalling,
power loss of more than 15%, or surging.The OEM's recommended
maximum operating temperature, horsepower, engine speed, etc.
shall not be compromised or surpassed.

5.3.9.Safety and Emissions:The engine, after conversion,
shall meet all Federal and state safety rules and regulations,
all applicable EPA emission standards, Department of Public
Safety Vehicle Inspection Rules, and Texas Air Control Board
Regulation IV when operated on gasoline.The vendor shall
perform a minimum of three (3) emissions test on each vehicle
using a Four-Gas Analyzer.Data shall be taken at idle and at
2,500 RPM, no load.One test shall be performed prior to
conversion, with the vehicle operating on gasoline.A second
test shall be performed after conversion, with the vehicle
operating on LPG.A third test shall be performed after the
conversion with the vehicle operating on gasoline.The methods
and parameters for all test shall be identical, with the
exception of fuel used.This test will verify that the
converted vehicle has been converted in compliance with all
applicable emissions requirements.The results of the tests
shall be provided to the school district or ordering state
agency upon completion of each vehicle conversion.Payment
procedure will not be initiated until this documentation is

5.3.10. OEM Engine Speed Governor:Any OEM engine speed
governor shall not be made inoperable during conversion to LPG.
It shall remain operable when the vehicle is operating on LPG as
well as gasoline.

5.3.11. OEM Fuel Injection System:The fuel delivery system of
gasoline engines, if used, shall be made inoperable by means
which will not damage the injectors and associated components,
while the engine is operating on LPG and shall not be damaged by
short or long term use of LPG.

5.3.12. Radio (2-Way) Frequency (RF) Interference:All
electronic conversion components shall be designed to prevent
electromagnetic interference with 2-way radio equipment.

5.3.13. Engine Electronics:All electronics required to
properly interface with the original vehicle electronics, and
necessary in order to meet vehicle performance and emission
objectives shall be included in the conversion.

5.3.14. Installation Time:The installing dealer shall have a
period of time not to exceed five (5) working days in which to
install, adjust and test each fuel conversion system.

5.3.15. School Bus Installations:Prior to the initial
installation of or conversion to a LP-gas system on any vehicle
to be used as a school bus by either public or private
educational institutions or mass transit vehicles, an applicant
(the ultimate consumer or licensee, as the case may be), making
the initial installation or conversion shall submit a LPG Form
503, Application to Install a LPG System on School Bus/Mass
Transit Vehicles, and other information deemed necessary by the
LP-Gas Division, Railroad Commission of Texas for review.

5.4.Warranty: 5.4.1.Standard Warranty:All conversion systems shall carry
the manufacturers' standard warranty and shall be guaranteed
against defects in materials, workmanship, and performance for a
minimum of one (1) year.

The warranty shall begin on the date of acceptance of the unit
by the school district or state agency.During this warranty
period, the vendor shall repair or replace defective components
and/or units at not cost to the State of Texas or the school

5.4.2.Warranty Responsibility:In case of warranty work on an
engine converted to use LPG, if there is a question of whether
it is the responsibility of the OEM or the vendor, it shall
automatically become the vendor's responsibility.If the
question is not resolved within one (1) week from the date of
notification to the vendor by the owner, the vendor will
arrange, with the permission of the owner, for the vehicle to be
repaired by a duly licensed carburetion technician, at an OEM or
other facility chosen by the owner, at not cost to the owner.
The vendor may then negotiate with the OEM if the repair is
covered by the OEM warranty or pay for the repairs if it is not,
unless it can be determined that the damage to the engine was
due to improper operation such as low oil, low water, etc.A
copy of the conversion equipment manufacturer's warranty and the
vendor's supplemental warranty shall be provided to the state
agency or school district at the time of vehicle delivery.
Payment for the vehicle (s) cannot be processed until these
documents are provided.

When major warranty repairs are required, the state agency or
school district will notify a representative of the vendor's
Texas dealer by telephone as designated by the bidder.Major
repairs are defined as those repairs other than minor
adjustments, replacement of hoses, etc..Major warranty repair
work means major repair to the engine due to operation of the
engine on LPG.All conversion components shall be covered.
Diagnosis of the actual repairs required will be the
responsibility of the vendor.The vehicle (s) will be made
available at the location designated by the owner.The repair
work may be performed by the vendor or his authorized
representative.At the vendor's option, the unit may be taken
by the vendor to a commercial repair facility.The vendor shall
be responsible for the cost of the round trip transportation of
the vehicle (s).

5.4.3.General Engine Warranty:The vendor shall warrant
converted engines for six (6) months or 6,000 miles, whichever
occurs later against damages due to the operation of the engine
on LPG.This warranty shall be equal to or better than the
OEM's original warranty on the engine and shall be limited to
damages caused by the alternative fuel used.

5.4.4.Personal Injury/Property Damage Liability:Proof of
product liability, as required by the Railroad Commission of
Texas, shall be provided with the Invitation for Bids.

5.5.List of References:It is the intent of this specification
to provide for installation of fuel conversion systems by
licensed, skilled and experienced installers only, who are
capable of providing not only safe installations, but conversion
systems that perform as required.Before an award will be
considered, the apparent low bidder shall supply GSC with a list
of at least five (5) different entities for which the conversion
facility has successfully converted gasoline vehicles to LPG use
within the last three (3) years.In addition, the bidder shall
provide proof of the business for a period of not less than six
(6) months.This list shall include the name of the school
district, state agency, or business, complete address, name and
phone number of a contract person familiar with the
installation, and number of vehicles converted for each
reference.If two (2) or more of the references indicate
unacceptable performance as determinedby the Purchasing
Division, Texas Procurement and Support Services, the bidder will not be
considered for an award.

5.6.Identification of Equipment:The apparent low bidder will
be required to furnish, prior to award, a list of the equipment
being utilized for the conversion, the brand name, and the name
and address of the manufacturer of the equipment.

5.7.Options:When so specified in the Invitation for Bids, one
(1) or more of the following options shall be furnished:

5.7.1.Conversion System Purchase only (including fittings,
lines, etc., but not Vehicular Fuel Tanks and installation).

5.7.2.Conversion System and Vehicular Fuel Tank Purchase only (including fittings, lines, etc., but not installation). (Number and kinds of tanks must be specified in the Invitation for Bids by the ordering entity.) 5.7.3.Bi-Fuel Gauge:Option deleted.

5.7.4.LPG Fuel Gauge:A separate fuel gauge shall be provided
to indicate LPG fuel tank capacity.This gauge may be mounted
on, in, or below the instrument panel, or as specified in the
Invitation for Bids.This fuel gauge shall be readily visible
to the seated driver.

5.7.5.LPG Fuel Sensing Detectors:An LPG leak detector shall
be provided.It shall be installed in the passenger compartment
or trunk area, as specified in the Invitation for Bids.These
sensors shall be capable of detecting a concentration of LPG
that is 25% of a lower explosive limit or less.The sensor
shall initiate a warning light visible to the seated driver or
other audible warning device to indicate a leak.

5.7.6.Dynamometer Testing:Pre-conversion and/or
post-conversion dynamometer testing shall be provided, and
reports thereof shall be furnished.

5.7.7.Automatic Fuel Switch-Over Control:Option deleted.

5.7.8.Primary Fuel Over-ride Device:Option deleted.

5.7.9.Conventional Fuel Usage Indicator Lamp:A red
dash-mounted light shall be furnished to indicate when the
vehicle is operating on gasoline and shall be so labeled.

5.7.10. Instruction on Safety, Operation and Preventative
The vendor shall provide a minimum of two (2)
hours of instruction by a competent technician licensed by the
Railroad Commission of Texas to install and repair LPG equipment
in the use, operation, safety and preventive maintenance of the
converted vehicle (s).This instruction will be conducted at a
site selected by the owner.

5.7.11. Extended Warranty:The conversion system and related
components shall be warranted against all defects in material
and workmanship for a period of not less than thirty-six (36)
months or 50,000 miles, whichever occurs first, and shall cover
100% parts and labor for the converted unit.If the
manufacturer's standard warranty exceeds thirty-six (36) months
or 50,000 miles, the standard warranty shall be in effect.

5.7.12. Other TxDOT (or ordering entity) Warranty Option:(When
ordering this option, the ordering entity shall specify in
detail, the warranty required on the Invitation for Bids.)

6.TESTING:Testing shall be done by, or at the direction of,
the Texas Procurement and Support Services and/or the receiving school
district or state agency.Tests shall be performed on products
from shipments to ordering agencies.In the event products
tested fail to meet or exceed all conditions and requirements of
this specification, the cost of the samples used and the cost of
testing shall be borne by the supplier.

7.SAMPLES:Unless otherwise specified in the Invitation for
Bids, no prepurchase samples shall be required.Samples tested
shall be obtained from products supplied on regular orders.

8.INSPECTION:Products furnished under this specification
shall be inspected by, or at the direction of the Texas Procurement and Support Services and/or the ordering school district or state
agency (as applicable) either at the destination or place of

9.AVAILABILITY OF SERVICE:Factory-authorized service shall be
available within the State of Texas:

9.1.Service:When so specified in the Invitation for Bids, the
bidder shall submit a current list of companies or individuals,
and their addresses, who can perform service on the products

9.2.Parts:An adequate supply of repair parts shall be carried
in stock within the State of Texas for the expected life of all
products furnished under this specification.

10.INSTRUCTION BOOKS and/or MANUALS:The vendor shall furnish
one (1) copy (unless otherwise specified in the Invitation for
Bids) of any required operating/amintenance/troubleshooting
instructions for each conversion system installed or delivered.
The instructions shall accompany the system when installed or

11.PACKING and/or PACKAGING:Packaging for shipment shall be
in accordance with the manufacturer's standard practice and in a
manner readily accepted by common carriers engaged in interstate
commerce.Within the shipping carton, units shall be packed in
a manner designed to minimize damage during shipment due to
rough or improper handling.

12.MARKING and/or LABELING: 12.1.Marking:Each shipping container shall be clearly marked

12.1.1.Name of contents.


12.1.3.Name and address of the manufacturer.

The container or shipping documents shall include:

12.1.4.Order number or contract number.

12.1.5.Name and address or ordering agency.

12.1.6.Agency requisition number.

12.2.Labeling:Labels shall be installed at appropriate
locations on and in the converted vehicle in conformance with
the rules and regulations of the Railroad Commission of Texas to
indicate the vehicle is equipped for operation on LPG and for
required warnings.

13.BID LITERATURE:All bids shall be accompanied by a complete
and illustrated description of the products being offered.

14.COMPLIANCE:In order for consideration to be given to the
bid on an item under this specification, the bidder must comply
with the following conditions:

14.1.Equipment Identification:The make, model number, name of
manufacturer, brand or trade name, etc., as applicable, of the
item which the vendor proposes to furnish must be stated as part
of the bid.

NOTE: Bids on any equipment not listed on the California Air
Resources Board's latest list (or issued an Executive Order by
CARB) or approved conversion systems or other recognized
entities and not approved by the Railroad Commission of Texas
will not be considered.

14.2.Exceptions:Notwithstanding the above, any exception
taken by the bidder to the requirements and conditions of this
specification must be stated and described in detail as a part
of the bid.If no exceptions or deviations are identified in
this manner, the items must be furnished exactly as described

14.3.Proof:The bidder shall bear the burden of proof of
compliance with this specification.

15.PRODUCT INFORMATION:When considering the selection of
vehicles to convert to an alternative fuel, the school district
or state agency may want to consider the following:

15.1.Selection of Vehicles:As a general rule, newer vehicles
should be considered first for conversion, followed by those
that are somewhat older but still in good condition.Obviously,
those vehicles that are near the end of their useful life and
must soon be replaced, should not be candidates for conversion.
Any vehicle that has several years of useful life that will be
kept in the fleet, might be considered for conversion.School
districts and state agencies may want to use LCCBA to ascertain
if it is cost effective to convert an older vehicle to an
alternative fuel(See guidelines in the GSC's workbook (See

15.2.Selection of Alternative Fuels:All of the Texas Air
Control Board approved alternative fuels have advantages and
disadvantages.The one selected should be the one that is the
most cost effective meeting the needs of the particular fleet
under consideration.

15.2.1. Safety:The use of CNG and LPG as vehicle fuels has had
an outstanding safety record and these alternative fuels are
probably safer than gasoline.LPG and CNG fuel tanks normally
will not rupture or leak fuel resulting in fires even in
accidents in which the vehicle is totally demolished.When
conversion systems are properly installed, and the vehicle is
operated and maintained as recommended, this should result in a
vehicle that will have a safety record at least as good as a
comparable operated and maintained gasoline vehicle.However,
all recommended safety precautions and suggested operating
procedures should be followed meticulously.

Both CNG and LPG have very narrow limits of flammability and
much higher ignition temperatures than gasoline.

15.2.2. Selection of Vehicular Fuel Tanks:There are basically
four (4) different types of fuel tanks approved for installation
on vehicles using CNG and one (1) for LPG (See Paragraph tanks are much lighter in weight than steel
tanks and the labor in removing and reinstalling aluminum tanks
for testing is much less.Composite aluminum and steel tanks
have a weight advantage over aluminum and steel tanks,
respectively.Steel tanks must be removed from the vehicle and
tested every five (5) years; aluminum and all composite metal
tanks must be removed from the vehicle and tested every three
(3) years.LPG tanks and tanks manufactured to ASME
specifications does not have to be re-tested.

16.ORDERING DATA:When ordering products conforming to this
specification, the requisitioning agency or school district
shall specify the following:

16.1.The number of this specification (055-20-02).

16.2.Engine Type and size (indicate whether carbureted or
electronic fuel injected type, See Paragraph 3.).

16.3.Fuel Tank Range required (See Paragraph

16.4.Fuel Gauge type (digital or analogue, See Paragraph

16.5.Refueling Receptacle Location (See Paragraph 5.2.8.).

16.6.Pre-conversion Dynamometer Test, if required (See
Paragraphs 5.3.5. and 5.3.7.).

16.7.Post-conversion dynamometer Test, if required (See
Paragraphs 5.3.6. and 5.3.7.).

16.8.Options (See Paragraph 5.7.).

16.9.Quantity of vehicles to be converted, or, number of
systems ordered of each engine type and size.

specification may be obtained by writing or calling:

Bid Services
Texas Procurement and Support Services
P. O. Box 13186
Austin, TX78711-3047
(512) 463-3416

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